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flurbiprofen sodium The past 20 years, the standard treatment for hepatitis C has involved a grueling one-year regimen of pills and injections. These two antiviral drugs, known as ribavirin and interferon-alpha, cause flu-like side effects including nausea, diarrhea and muscle achiness. The introduction of new drugs from Merck and Vertex Pharmaceuticals in 2011 helped shorten the treatment period and boost cure rates as high as 75%.